I have been using Windows (8 then 10) in Parallels on a Mac for years. It has always been very fast.
Over 3 MacBook Air 11" with (2 then 4Gb RAM). Over many versions of MacOS and 2 versions of Windows.
I recently got a 12" MacBook (8Gb RAM) - and the VM also ran fine there. That was until I enabled retina mode in the VM. Then Parallels got slow - often locking up for 10 seconds.
So I spoke to Parallels and they couldn't fix it so I tried VMWare. It is a little better but also locks up from time to time in retina mode.
If you look at Geekbench the 12" is around 3000 - which is within 10% the Geekbench score of low-end MacBook i5 Pro 13" 2015 - and on par with Airs.
Is this a driver issue - or does retina just require a lot more speed?
Would a high-end new MacBook Pro likely fix this?
Has anyone had these issues and found a way to overcome them?